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10.1007/BF02414069 | 1992 | |||
TAKEUCHI,N. and TAMURA,M., A surface which contains helical geodesics, Bull. Tokyo Gakugei Univ.(4) 42 (1990), 15?18. | 1990 | |||
Semi-Riemannian Geometry | 1983 | |||
A Comprehensive Introduction to Differential Geometry, Vol. III | 1975 | |||
Elementary Differential Geometry | 1966 |